乙腈-NaCl-H_2O双水相萃取ICP-AES测定食盐中的铜和铅  

Development of Acetonitrile-NaCl-H_2O Two-Phase Extraction Combined with ICP-AES for Determination of Copper and Lead in Salt

作　　者：高福凯[1] 贾风燕[1] 陈璐思[1] 李桂芝[1] 刘振波[1] 刘永明[1] 

机构地区：[1]烟台大学化学化工学院,山东烟台264005

出　　处：《烟台大学学报（自然科学与工程版）》2013年第1期49-52,65,共5页Journal of Yantai University(Natural Science and Engineering Edition)

基　　金：山东省自然科学基金资助项目(ZR2011BM009)

摘　　要：研究了乙腈-NaCl-H2O双水相体系的分相条件及在吡咯烷二硫代氨基甲酸铵(APDC)做络合剂时对铜和铅的萃取行为,并结合电感耦合等离子体原子发射光谱仪(ICP-AES)建立了一种测定食盐中铜和铅的方法.该方法在萃取Cu和Pb的同时去除了大量的NaCl基体,从而在ICP-AES测定食盐中痕量Cu、Pb时,去除了高盐的基体干扰.实验中铜和铅的平均回收率分别可以达到106.0%和96.2%,RSD为0.76%和0.83%,计算得出检出限分别为5.0×10-4mg.kg-1和2.3×10-2mg.kg-1,结果令人满意.该方法为高盐样品中金属离子的检测提供了一种新思路.In this study, a simple and efficient acetonitrile-sodium-H2O chloride aqueous two-phase system （ATPS） is developed coupled with inductively coupled plasma atomic emission spectrometry（ICP-AES） for the ex- traction and the determination of cooper and lead in salt. Samples are pretreated by ATPS with 1-Pyrrolidinecar- bodithioic acid ammonium salt （APDC） used as complex agent. The phase separation conditions and extraction ef- ficiency factors, such as pH value and mass fraction of acetonitrile are investigated and optimized. The recoveries of copper and lead are 106. 0% and 96.2%, RSD are 0.76% and 0.83% , and limits of detection are 5.0 × 10 -4 mg · kg-1 and 2.3 ×10-2mg ·kg-1 ,respectively. The proposed method can be successfully applied for the pretreat- ment and determination of copper and lead in real salt samples. The results show that the interference of salt matrix with Cu and Pb determination using ICP-AES can be removed by the suggested method.

关 键 词：双水相 基体去除 ICP-AES 食盐 铜 铅 

分 类 号：O657.31[理学—分析化学]